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The Canon EF 1.4x II Extender is a high-quality teleconverter that preserves the image quality of the lens it's mounted to and multiplies its focal length by 1.4x. When combined with pro level EOS cameras & EF supertelephoto lenses with image stabilization, near imperviousness to weather extremes is achieved thanks to rubber gasket seals. Improved anti-reflective internal coatings also increase transmissivity & performance in backlit conditions.

The extender will cut back the amount of light by one f/stop. For example using a 1.4x teleconverter with a 300mm f/2.8 lens will effectively increase the focal length to approximately 420mm and the f/2.8 aperture will now be f/4. Teleconverters are best used with longer telephoto lenses and are not recommended for lenses wider than 50mm, e.g. 28-105mm (35mm format).

Note: This teleconverter will only fit and work with a select list of lenses. Please click here for the compatibility chart of all compatible lenses.
Notes on Camera Compatibility

Autofocus is possible on any EOS camera when combined with a lens having an f/4 or faster maximum aperture.

If the lens is attached to an EOS camera having multiple focusing points and an extender attached, only the center focusing point will be usable for AF.

When attached to the EF 180mm f/3.5L Macro USM lens, the autofocusing range is from 2.6' (0.8 m) to infinity. It varies slightly with the EOS-1v, EOS-1N, EOS-1 and EOS-3.